These patches fix ip multicast route (ipmr) on 2.5.73.

1 - Trivial C99 initialization
2 - Change functions/variables to static
3 - Drop and reacquire RTNL in error path
4 - Use time_after()
5 - Use alloc_netdev
6 - Fix OOPS on dropped packets
7 - Get rid of skb_linearize

Tested on 8-way SMP by bringing up pimd.